Filter bag structure for vacuum cleaners



Oct. 8, 1957 c. E. MEYERHOEFER 2,808,898 FILTER BAG STRUCTURE FOR VACUUM CLEANERS Original Filed May 27, 1952 lllllmllllallllnuniiil'ms V INVENTOR ('ar/ E/Wyerfiae/er ATTORNEYS Un ted States, Pa e FILTER BAG STRUCTURE FOR VACUUM CLEANERS Carl E. Meyerhoefer, Brooklyn, N. Y., assignor to Lewyt Corporation, Brooklyn, N. Y., a corporation of New York Original application May 27, 1952, Serial No. 290,139, now Patent No. 2,720,277, dated October 11, 1955. Divided and this application August 18, 1955, Serial N 0. 529,114

1 Claim. (Cl. 183-51) This invention relates to a structurally and functionally improved filter bag for use in connection with vacuum cleaners of the type shown, for example, in my prior Patent 2,639,001, dated May 19, 1953.

This application is a division of my prior application for United States Letters Patent, Serial No. 290,139, filed on May 27, 1952, for Filter Structures for Vacuum Cleaners, now Patent No. 2,720,277, dated October 11, 1955.

By means of the present teachings, a filter bag is furnished which may be economically manufactured and readily applied to the assembly of a vacuum cleaner. So applied, it will receive and retain foreign materials sucked up by the air stream entering the assembly. After the bag is filled, it may readily be detached from the assembly and disposed of.

With these and other objects in mind, reference is had to the attached sheet of drawings illustrating practical I embodiments of the invention, and in which:

Fig. 1 is a plan view of a filter bag;

Fig. 2 is a transverse sectional view taken along the line 22 in the direction of the arrows as indicated in Fig. 1;

Fig. 3 is a fragmentary sectional side view of the upper or outer part of a bag structure and showing a unit embodying a construction different from that illustrated in the preceding views;

Fig. 4 is a view similar to Fig. 3 showing an alternative form of design; and

Fig. 5 is also a view similar to Fig. 3 but showing an additional arrangement of structure.

In these several views, the reference numeral indicates a body of a bag preferably made of air-porous paper. That bag embraces any desired configuration and preferably, as shown, a square outline involving four side walls generally extending at right angles to each other. The bottom of the bag (not shown) is closed. Likewise, the upper end of the bag involves a closed structure, except that an opening is formed centrally of the same. It is through this opening that the fitting of a vacuum cleaning apparatus is extended for the purpose of properly supporting the bag and directing the incoming dirt-laden air into the bag interior.

Referring to Figs. 1 and 2, a strip 11 conveniently formed of relatively heavy paper has its ends secured to the upper bag surface and is extended at a point substantially midway of its ends to provide a ring or collar portion 12. That portion is curled or bent inwardly as indicated at 13 to provide a surface contactible with the exterior face of the aforementioned fitting which will frictionally ride in contact therewith. Preferably the attachment of the ends of the strip 11 to the bag surface is achieved by a layer of adhesive 14. A similar layer may underlie the ring or collar portion 12 to secure it against shifting with respect to the adjacent bag surface. Between these points of attachment, the strip 11 is free of the bag surface.

2,808,898 Patented Oct. 8, 1957 As afore brought out, the assembly of the vacuum cleaning apparatus is opened to furnish access to the interior thereof and the fitting defining the air-intake opening is extended through the hole or opening of the bag. So extended, it will frictionally engage and retain the collar 12 by bearing against the in-turned surface 13 thereof. The assembly is now closed and the vacuum cleaner is operated. Dust-laden air will enter through the fitting-into the bag interior. When suflicient foreign material has been accumulated within the bag and incident to the filtering action of the latter as the air passes though its walls, then operation of the cleaner is discontinued. Upon the assemblys being opened, the collar or ring portion 12. may be forced out of contact with the fitting. Now by simply inserting the fingers under the loops of the strip 11 provided between the zones at which it is secured to the bag, the latter may be lifted clear of the cleaner. It may be transported with-out soiling of the fingers to a desired location and there disposed of.

In the form of device shown in Fig. 3, a collar 15 is employed. This embraces a cylindrical member conveniently formed of cardboard and having an internal diameter such that it may receive and frictionally engage with the surface of the fitting forming a part of the cleaner assembly. The length of this collar permits it to extend not alone beyond the outer face of the bag body, but also internally thereof through the opening provided in that body. An L-shaped ring 16, again conveniently formed of cardboard, encircles that portion of collar 15 which projects inwardly of the bag body. The face of the ring extending perpendicular to the axis of collar 15 engages the inner surface of the bag body adjacent the opening formed in the latter. Conveniently a layer 17 of suitable adhesive intervenes and secures these surfaces to each other. That layer may, of course, also extend between the adjacent surfaces of the ring and the collar 15.

As in Fig. 4, the assembly may include a collar 18 having a length such that it will not alone extend from a point inside the bag body to a point sufiiciently beyond the outer face of the same, but will also embrace material adequate to furnish a beaded or rolled edge portion 19 at its inner end. Encircling this collar is a ring 20 which functionally corresponds to ring 16. It is shifted to a position where it lies adjacent and in engagement with bead 19 which prevents its further movement in that direction with respect to the collar. A second collar is telescoped over collar 18. This second collar has been indicated at 21. It has a length such that its outer edge will align with the adjacent edge of collar 18 while its inner edge abuts ring 20 and maintains the latter in position. Conveniently, a layer 22 of adhesive is interposed between the collars 18 and 21 and also between the outer surface of ring 20 and the adjacent face of the bag body 10. It will be seen that this structure functions in the same manner as that illustrated in Fig. 3. An L-shaped ring assembly is in effect provided by element 20 and the adjacent surface and bead 19 of collar 18 when the parts are secured to each other.

Finally as in Fig. 5, a collar 23 may be extended through the opening in the bag body similar to the structures heretofore described. This collar supports an L-shaped ring 24 adjacent its inner end. A layer 25 of adhesive may be interposed between the adjacent surfaces of this ring and the bag body. This layer may be extended to intervene the surfaces of the ring and collar 23. By means of a roller or in any other suitable manner, the face of collar 23 at a point adjacent its inner end is formed with a groove 26 which extends inwardly. A corresponding groove 27 is formed in that leg of ring 24 which initially is extended parallel to the axis of collar 23. The indentation or ridge formed as a consequence of providing'groove 27 will extend into the surfaceof groove 26. Especially in the case of adhesive being employed, the parts will thus be further interlocked against displacement with. respect to-each other.

Thus among others, the several objects of the invention as specifically aforenoted are achieved. Obviously, numerous changes in construction and rearrangements of the parts might be resorted to without departing from the spirit of the invention as defined by the claim.

I claim:

A vacuum cleanerfilter assembly which is replaceable in its entirety, said assembly including in combination a bag formed of air-pervious material and having an opening in one of its walls, a collar having an area and outline corresponding to said opening and positioned beyond the outer face of the material providing said bag,

4 7 said collar being substantially rigid and self-sustaining whereby its inner face may be conformed to and frictionally engage a vacuum cleaner fitting to retain the filter assembled therewith, a separate ring encircling said collar and extending outwardly therefrom, said collar beingconstricted in the form of a groove in a zone adjacent said ring, a flange attached to said ring, said flange being also formed with a groove in one face to provide an extended portion in its opposite face and said extended portion projecting intothe groove formed in said collar thereby to interlock said flange against movement with respect to the latter.

7 References Cited in the file of this patent UNITED STATES PATENTS Meyerhoefer, Oct. 11,1955 

